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Subject: svn commit: r1811746 - in /httpd/httpd/branches/2.4.x: ./ CHANGES
 server/protocol.c
Date: Tue, 10 Oct 2017 17:51:13 -0000
To: cvs@httpd.apache.org
From: jorton@apache.org
Message-Id: <20171010175116.AE1DD3A028D@svn01-us-west.apache.org>
archived-at: Tue, 10 Oct 2017 17:51:21 -0000

Author: jorton
Date: Tue Oct 10 17:51:13 2017
New Revision: 1811746

URL: http://svn.apache.org/viewvc?rev=1811746&view=rev
Log:
Merge r1808230 from trunk:

* server/protocol.c (ap_content_length_filter): Rewrite the content
  length filter to avoid arbitrary memory consumption for streaming
  responses (e.g. large CGI script output).  Ensures C-L is still
  generated in common cases (static content, small CGI script output),
  but this DOES change behaviour and some responses will end up
  chunked rather than C-L computed.

PR: 61222
Submitted by: jorton, rpluem
Reviewed by: jorton, wrowe, ylavic

Modified:
    httpd/httpd/branches/2.4.x/   (props changed)
    httpd/httpd/branches/2.4.x/CHANGES
    httpd/httpd/branches/2.4.x/server/protocol.c

Propchange: httpd/httpd/branches/2.4.x/
------------------------------------------------------------------------------
--- svn:mergeinfo (original)
+++ svn:mergeinfo Tue Oct 10 17:51:13 2017
@@ -4,4 +4,4 @@
 /httpd/httpd/branches/trunk-buildconf-noapr:1780253-1795930
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 345,1685347,1685349-1685350,1685650,1685659,1685779,1686085,1686853,1686856,1687539,1687680,1687980,1688274,1688331,1688339-1688341,1688343,1688399,1688474-1688475,1688536,1688538,1688660,1689325,1689605,1689694,1689698,1690120,1690137,1690248,1691374,1691582,1691592,1691819,1691908,1692285,1692432,1692486,1692516,1693792,1693918-1693919,1693963,1694903,1694936,1694950-1694951,1695170,1695727,1695874,1695885,1695920,1696105,1696264,1696266,1696279,1696428,1696442,1696565,1696592,1696607,1696755,1696881,1697013,1697015,1697051,1697323,1697339,1697370,1697389,1697446,1697543,1697634,1697855,1698023,1698103,1698107,1698116,1698133,1698330,1698334,1700271,1700275,1700317-1700322,1700326,1700328,1700330-1700332,1700334,1700336,1700338,1700418,1700514,1700777,1700851,1700917,1700925,1700968,1701005,1701145,1701178,1701204,1701347,1701436,1701545,1701717,1702643,1702919,1702948,1703152,1703417,1703642,1703807,1703813,1703822,1703871,1703902,1703952,1704099,1704241,1704262,1704797,1704799,1
 704826,1705099,1705134,1705194,1705217,1705257,1705749,1705776,1705823,1705826,1705828,1705833,1705922,1705983,1706275,1706523,1706595,1706627,1706635,1706637,1706640,1706918,1706942,1706989,1707002,1707230-1707231,1707497,1707512,1707519,1707591,1707626-1707627,1707640,1707831,1707883,1707889,1708107,1709008,1709587,1709596,1709602,1709995,1710095,1710105,1710231,1710380,1710391,1710419,1710572,1710583,1710723,1711479,1711553,1711648,1711728,1711902,1712382,1713040,1713043,1713209,1713937,1715023,1715255,1715273,1715567-1715568,1715570-1715572,1715576,1715581-1715585,1715886,1716211,1716388,1716460,1716487,1716660,1716940,1717063,1717086,1717639,1717816,1717934,1717958,1717975,1717985,1718314,1718338,1718400,1718476,1718496,1718514,1718556,1718569,1718598,1719016,1719018,1719189-1719190,1719252,1719254-1719255,1719257,1719967,1720129,1720996,1721313,1721685,1721899,1722137,1722154,1722177,1722195,1722229,1722320,1722328,1722334,1722350-1722351,1722358,1722377,1722572,1722701,172312
 2,1723143,1723284,1723295,1723567,1723953,1724847,1724857,1724879,1724992-1724993,1724995,1725018,1725031,1725090,1725120,1725149,1725325,1725328,1725387,1725392,1725394-1725395,1725445,1725468,1725485,1725489,1725498-1725499,1725516,1725523,1725545,1725567,1725581,1725602,1725822,1725940,1725967,1726009,1726026,1726038,1726049,1726051-1726052,1726055,1726086,1726167,1726233,1726675,1726705,1726798,1726881,1726888,1727071,1727111,1727317,1727544,1727573,1727603,1727842,1728326,1728804,1729208,1729235,1729374,1729376,1729826,1729847,1729929-1729931,1729960,1730079,1730297,1730640,1730723,1730865,1731929,1732228,1732252,1732353,1732369,1732716,1732954,1732986,1733056,1733064,1733068,1733088-1733089,1733275,1733523,1733537-1733538,1733691,1734006,1734125,1734239,1734294,1734412,1734561,1734807,1734817,1734947,1734955,1734989,1735088,1735159,1735337,1735608-1735609,1735611,1735668,1735786,1735906,1735931,1735935,1735942,1735952,1736156,1736186,1736243,1736250,1736463,1736681,1736686,173
 7006,1737014,1737020-1737021,1737102,1737114,1737125,1737254,1737256,1737265,1737447,1737449,1737451,1737476,1738217,1738331,1738333,1738464,1738466,1738486,1738563,1738628,1738631,1738633,1738635,1739008,1739146,1739151,1739193,1739201,1739303,1739312,1739738,1739932,1740075,1740084,1740108,1740110,1740155,1740735,1741045,1741065,1741112,1741115,1741268,1741310,1741392,1741414,1741446,1741461,1741557,1741564,1741570,1741596,1741621,1741648,1741934,1742005,1742135,1742260,1742359,1742444-1742447,1742460,1742791-1742792,1743335,1743517,1743699,1743788,1743816,1744203-1744204,1744206,1744283,1744415,1744421,1744458-1744459,1744712,1744751,1744767,1744778,1744980,1745034,1745039,1745175,1745767,1745835,1746207,1746647,1746988,1747170,1747469,1747531,1747550,1747735,1747808,1747810,1747946,1748047,1748155,1748368,1748448,1748531,1748653,1748888,1749151,1749401,1749404,1749505,1749658-1749659,1749676,1749678,1749695,1749924-1749925,1750043,1750218,1750335,1750392,1750407,1750412,1750416,
 1750420,1750474,1750494,1750507-1750508,1750553,1750567,1750750,1750779,1750854-1750855,1750947,1750955,1750960,1751970,1752087,1752096,1752145,1752331-1752333,1752347,1752415,1753167,1753224,1753228-1753229,1753257,1753315-1753316,1753498,1753541,1753592,1753594,1753777,1754129,1754164,1754391,1754399,1754414,1754534,1755323,1756038,1756542,1756553,1756611,1756631,1756844,1756846,1756848,1756852-1756853,1757009-1757011,1757029-1757031,1757061,1757524,1757534,1757540,1757662-1757663,1757985,1758003,1758083,1758307-1758311,1758446,1758558,1759415,1759984,1760018,1761434,1761477,1761479,1761548,1761714,1761824,1762512,1762515,1762517,1762580,1762701-1762703,1762718,1762723,1762742-1762743,1763158,1763246,1763613,1764005,1764040,1764046,1764236,1764243,1764255,1765318,1765328,1765357,1765420,1766097,1766129,1766160,1766308,1766424,1766691,1766851,1766857,1766998,1767128,1767180-1767181,1767553,1767564,1767803,1767936,1768160,1768245,1769192,1769332,1769550,1769593,1769596,1769600,17703
 95,1770750,1770752,1770768,1770771,1770828,1770951,1770998,1771001,1771015,1771789,1771791,1771827,1772339,1772489,1772504,1772576,1772812-1772813,1772919,1773159,1773162,1773293,1773346,1773397,1773761,1773779,1773812,1773861-1773862,1773865,1774008,1774018,1774023,1774068-1774069,1774286,1774288,1774538,1774541,1774602,1774609,1775173,1775195,1775199,1775487,1775664,1775770,1775775,1775813,1775833,1775858,1775944,1775946,1776459,1776463,1776735,1776738,1776956,1777160,1777324,1777354,1777460,1777556-1777557,1777593-1777594,1777672,1777923,1778319,1778331,1778350,1778630,1779077,1779091,1779111,1779354,1779459,1779525,1779528,1779573-1779574,1779623,1779699,1779738,1779743,1779896,1779972,1779979,1780095,1780159,1780328-1780329,1780576,1780596,1780598,1780971,1781187,1781190,1781304,1781312,1781324,1781328-1781329,1781575,1781577,1781580,1781687,1782164,1782166,1782193-1782194,1782323,1782418-1782419,1782482,1782532,1782875,1782944,1782958,1782975,1783056,1783305,1783722-1783723,17
 83764-1783765,1783770,1783842,1783849,1784002,1784203,1784205,1784227-1784228,1784275,1784318,1784366,1784372,1784571,1785115,1785672,1785683,1785752-1785753,1785871,1785907,1786009,1786512,1786575-1786576,1786715,1787051,1787053,1787141,1787525,1787553,1787604,1788032-1788033,1788040,1788430,1788451,1788508,1788672,1788981,1788996,1788998,1789000,1789220-1789221,1789224,1789276,1789279,1789387,1789395,1789520,1789535,1789692,1789740,1790102,1790113,1790284,1790754,1790826-1790827,1790842,1790850,1790852-1790853,1790855,1790860,1790973,1790978,1791377,1791388,1791400,1791669,1791773,1791790,1791975,1792092,1792195,1792212,1792589,1792675,1793525,1793533,1793932,1794049,1795635,1795651,1795830,1795931,1796343,1796348,1796350,1796446,1796493,1796864,1797550,1797745,1798785,1799435,1799437,1799784,1799786,1800173,1800306,1800393,1800594,1800689,1800788,1800809,1800815,1800817,1800819,1800830,1800833,1800917,1800919,1800978,1801594,1801665,1801994-1801995,1802305,1802309,1802336,1802845
 ,1802875,1803392,1803396,1803398,1803420,1803454,1804090,1805099,1805188,1805190,1805206,1805322,1807655,1808008,1808085,1808230,1808671,1808723,1808780,1811192,1811285,1811540-1811541,1811569-1811570

Modified: httpd/httpd/branches/2.4.x/CHANGES
URL: http://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/CHANGES?rev=1811746&r1=1811745&r2=1811746&view=diff
==============================================================================
--- httpd/httpd/branches/2.4.x/CHANGES [utf-8] (original)
+++ httpd/httpd/branches/2.4.x/CHANGES [utf-8] Tue Oct 10 17:51:13 2017
@@ -1,6 +1,10 @@
                                                          -*- coding: utf-8 -*-
 Changes with Apache 2.4.29
 
+  *) core: Rewrite the Content-Length filter to avoid excessive memory
+     consumption. Chunked responses will be generated in more cases
+     than in previous releases.  PR 61222.  [Joe Orton, Ruediger Pluem]
+
   *) mod_ssl: Fix SessionTicket callback return value, which does seem to
      matter with OpenSSL 1.1. [Yann Ylavic]
 

Modified: httpd/httpd/branches/2.4.x/server/protocol.c
URL: http://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/server/protocol.c?rev=1811746&r1=1811745&r2=1811746&view=diff
==============================================================================
--- httpd/httpd/branches/2.4.x/server/protocol.c (original)
+++ httpd/httpd/branches/2.4.x/server/protocol.c Tue Oct 10 17:51:13 2017
@@ -1674,62 +1674,88 @@ AP_CORE_DECLARE_NONSTD(apr_status_t) ap_
         ctx->tmpbb = apr_brigade_create(r->pool, r->connection->bucket_alloc);
     }
 
-    /* Loop through this set of buckets to compute their length
-     */
+    /* Loop through the brigade to count the length. To avoid
+     * arbitrary memory consumption with morphing bucket types, this
+     * loop will stop and pass on the brigade when necessary. */
     e = APR_BRIGADE_FIRST(b);
     while (e != APR_BRIGADE_SENTINEL(b)) {
+        apr_status_t rv;
+
         if (APR_BUCKET_IS_EOS(e)) {
             eos = 1;
             break;
         }
-        if (e->length == (apr_size_t)-1) {
+        /* For a flush bucket, fall through to pass the brigade and
+         * flush now. */
+        else if (APR_BUCKET_IS_FLUSH(e)) {
+            e = APR_BUCKET_NEXT(e);
+        }
+        /* For metadata bucket types other than FLUSH, loop. */
+        else if (APR_BUCKET_IS_METADATA(e)) {
+            e = APR_BUCKET_NEXT(e);
+            continue;
+        }
+        /* For determinate length data buckets, count the length and
+         * continue. */
+        else if (e->length != (apr_size_t)-1) {
+            r->bytes_sent += e->length;
+            e = APR_BUCKET_NEXT(e);
+            continue;
+        }
+        /* For indeterminate length data buckets, perform one read. */
+        else /* e->length == (apr_size_t)-1 */ {
             apr_size_t len;
             const char *ignored;
-            apr_status_t rv;
-
-            /* This is probably a pipe bucket.  Send everything
-             * prior to this, and then read the data for this bucket.
-             */
+        
             rv = apr_bucket_read(e, &ignored, &len, eblock);
+            if ((rv != APR_SUCCESS) && !APR_STATUS_IS_EAGAIN(rv)) {
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(00574)
+                              "ap_content_length_filter: "
+                              "apr_bucket_read() failed");
+                return rv;
+            }
             if (rv == APR_SUCCESS) {
-                /* Attempt a nonblocking read next time through */
                 eblock = APR_NONBLOCK_READ;
+                e = APR_BUCKET_NEXT(e);
                 r->bytes_sent += len;
             }
             else if (APR_STATUS_IS_EAGAIN(rv)) {
-                /* Output everything prior to this bucket, and then
-                 * do a blocking read on the next batch.
-                 */
-                if (e != APR_BRIGADE_FIRST(b)) {
-                    apr_bucket *flush;
-                    apr_brigade_split_ex(b, e, ctx->tmpbb);
-                    flush = apr_bucket_flush_create(r->connection->bucket_alloc);
-
-                    APR_BRIGADE_INSERT_TAIL(b, flush);
-                    rv = ap_pass_brigade(f->next, b);
-                    if (rv != APR_SUCCESS || f->c->aborted) {
-                        return rv;
-                    }
-                    apr_brigade_cleanup(b);
-                    APR_BRIGADE_CONCAT(b, ctx->tmpbb);
-                    e = APR_BRIGADE_FIRST(b);
+                apr_bucket *flush;
 
-                    ctx->data_sent = 1;
-                }
+                /* Next read must block. */
                 eblock = APR_BLOCK_READ;
-                continue;
-            }
-            else {
-                ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(00574)
-                              "ap_content_length_filter: "
-                              "apr_bucket_read() failed");
-                return rv;
+
+                /* Ensure the last bucket to pass down is a flush if
+                 * the next read will block. */
+                flush = apr_bucket_flush_create(f->c->bucket_alloc);
+                APR_BUCKET_INSERT_BEFORE(e, flush);
             }
         }
-        else {
-            r->bytes_sent += e->length;
+
+        /* Optimization: if the next bucket is EOS (directly after a
+         * bucket morphed to the heap, or a flush), short-cut to
+         * handle EOS straight away - allowing C-L to be determined
+         * for content which is already entirely in memory. */
+        if (e != APR_BRIGADE_SENTINEL(b) && APR_BUCKET_IS_EOS(e)) {
+            continue;
+        }
+
+        /* On reaching here, pass on everything in the brigade up to
+         * this point. */
+        apr_brigade_split_ex(b, e, ctx->tmpbb);
+        
+        rv = ap_pass_brigade(f->next, b);
+        if (rv != APR_SUCCESS) {
+            return rv;
+        }
+        else if (f->c->aborted) {
+            return APR_ECONNABORTED;
         }
-        e = APR_BUCKET_NEXT(e);
+        apr_brigade_cleanup(b);
+        APR_BRIGADE_CONCAT(b, ctx->tmpbb);
+        e = APR_BRIGADE_FIRST(b);
+        
+        ctx->data_sent = 1;
     }
 
     /* If we've now seen the entire response and it's otherwise